The core of you never changes. You may change your actions, opinions and beliefs but the core of you will remain the same. That inner fire that made you, you is still the same. You were born with it and those experiences that happened at your very early impressionable ages, revealed how your core deals with life are still in play. There perhaps is temporary change though. It is like a person quitting cigarettes for one month or ten months but that person on the 11th month comes back to smoke again for the rest of his life. In the end "You are who you are".